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OpenStudy (chris215):
Find f '(−4), if f(x) = (5x^2 + 6x)(3x^2 + 7). Round your answer to the nearest integer. Use the hyphen symbol, -, for negative values.
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OpenStudy (chris215):
i got -3214
OpenStudy (matt101):
I get a different answer. What is you general equation for f'(x)?
OpenStudy (chris215):
f'(x) = (10x+6)*(3x^2+7) + (5x^2 + 6x)*(6x) f'(-4) = (-40+6)*(48+7) + (80-24)*(-24) = -34*55 + 56*(-24)
OpenStudy (matt101):
Woops the answer you got is exactly right! I accidentally used 4 instead of -4!
OpenStudy (chris215):
thats ok thank you!
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